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Finding the Fourth Proportional to 994.91, 1,485.66 and 812.66

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Solution

The fourth proportional to 994.91, 1,485.66 and 812.66 is: 1,213.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.91 : 1,485.66 = 812.66 : x
  2. Step 2: Convert to fraction form
    994.91/1,485.66 = 812.66/x
  3. Step 3: Cross multiply
    994.91x = 1,485.66 × 812.66
  4. Step 4: Simplify right side
    994.91x = 1,207,336.46
  5. Step 5: Solve for x
    x = 1,207,336.46/994.91
  6. Step 6: Final answer
    x = 1,213.51

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.